Need advice - baby last name

I am due mid Sept and am having a hard time on deciding the last name. The BD and I are no longer together but we are on friendly terms so far. W have a 1st and middle name (Marielle Naomi hopr there are no haters lol) that we have agreed on but can't decide what I should do about last name. Mine or his? I have no doubt that he will be involved but she will live primarily w me so I will be doing school etc.

Suggestions? Thoughts? Btw it's my first and he has a son from previous marriage that he has custody of.

If he is set on the baby having his last name, hyphenate. If not, give baby your last name, it will make it easier when it comes to school, doctors, dentists, etc, not always explaining who you are in relation to your child.

I have never shared a last name with my kids. I kept my maiden name after marriage, and they have their father's last name. Looking back, I kind of wish I'd hypenated. So that's honestly the option I would choose. But Heather raises some good questions to think about as well n